Click this button to delete a property that you have created for a subclass. For example, if you create a property and determine that you will not use it or that you do not need it, you can delete it.
You can delete only a property that you are creating in a new class. Otherwise, you can view, but not modify or delete, properties of classes. You cannot delete an inherited property in a subclass.
From the selection list under the Properties tab on the New Class dialog box, select the name of the property or the type of the property that you want to delete.
Click Delete Property or press Alt+d.
The property is deleted.